add json mapping exception mapper to jax ws rs Application

example.java

////
// By default, there is only http 500 error for unrecognized properties against request object,
// without any information, it's really annoying.
////

import javax.ws.rs.core.Response;
import javax.ws.rs.ext.ExceptionMapper;
import javax.ws.rs.ext.Provider;

import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException;

@Provider
public class JsonUnrecognizedPropertyExceptionMapper implements ExceptionMapper<JsonMappingException> {
    public Response toResponse(JsonMappingException exception) {
        String errorMessage = "illegal JSON request";
        if (exception instanceof UnrecognizedPropertyException) {
            final UnrecognizedPropertyException ex = (UnrecognizedPropertyException) exception;
            errorMessage = String
                    .format("Unknown property: %s of object: %s", ex.getUnrecognizedPropertyName(), ex.getReferringClass().getSimpleName());
        }
        return Response.status(Response.Status.BAD_REQUEST).entity(errorMessage).type("text/plain").build();
    }
}


///////

@ApplicationPath("/rest")
public class YourApplication extends Application {

    @Override
    public Set<Class<?>> getClasses() {
        Set<Class<?>> classes = new HashSet<Class<?>>();
        classes.add(YourPortal.class);
        // your other classes ...
        
        classes.add(JacksonObjectMapperProvider.class);
        classes.add(JacksonJsonProvider.class);
        classes.add(JsonUnrecognizedPropertyExceptionMapper.class);
        return classes;
    }
}